[CSM] Add method that display chat to client-sided lua. (#5089) (#5091)

* squashed: [Client-sided scripting] Don't register functions that don't work. (#5091)

src/script/lua_api/l_util.h

@@ -110,6 +110,8 @@ class ModApiUtil : public ModApiBase {
 public:
 	static void Initialize(lua_State *L, int top);
 
+	static void InitializeClient(lua_State *L, int top);
+
 	static void InitializeAsync(AsyncEngine& engine);
 
 };